{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "In this study , anodic TiO ( 2 ) nanotubes have been selectively closed by high energy focused ion beams and re - opened by low energy focused ion beams ."}
{"Chemical": ["TiO ( 2 )"]}